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st: Problem with -margeff-


From   James Shaw <shawjw@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Problem with -margeff-
Date   Thu, 9 Jul 2009 07:26:57 -0500

Dear Statalist,

I was using -margeff- and found that it would ignore the set values
for continuous variables when computing marginal effects.  This
appears to have been a bug in the 4/22/05 version that was fixed in
-margeff8- (2/10/06).  -margeff8- appears to produce the correct
marginal effects for continuous variables when they are fixed at
specific values.

On another note, the latest version of -margeff- (4/20/08) does not
seem to allow one to fix variables at specific values when computing
marginal effects.  I have no trouble calculating effects at the means
with the "at(mean)" option.  However, I receive an error message
"Invalid at() option: [fixed value for first regressor in list] must
not found" when computing effects at specific fixed values.

--
Jim


James W. Shaw, Ph.D., Pharm.D., M.P.H.
Assistant Professor
Department of Pharmacy Administration
College of Pharmacy
University of Illinois at Chicago
833 South Wood Street, M/C 871, Room 252
Chicago, IL 60612
Tel.: 312-355-5666
Fax: 312-996-0868
Mobile Tel.: 215-852-3045
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